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Which best describes how to calculate the scale factor of a pre-image and image?

Find the lengths of corresponding sides and then set up a ratio of pre-image to
image and then divide.
Find the lengths of corresponding sides and then set up a ratio of image to pre-
image and then divide.
Find the lengths of opposite sides and then set up a ratio of image to pre-image
then divide.
Find the lengths of opposite sides and then set up a ratio of pre-image to image
and then divide.

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The best method to calculate the scale factor between a pre-image and its image is to "Find the lengths of corresponding sides and then set up a ratio of image to pre-image and then divide." Option B

Calculating the scale factor of a pre-image and image involves identifying corresponding sides in the pre-image and its image and then setting up a ratio of the lengths of these corresponding sides in the image over the lengths of the corresponding sides in the pre-image.

Dividing these lengths produces the scale factor, which represents the proportion by which the pre-image has been enlarged or reduced to create the image.

User Roberto Milani
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